The problem was that the content of the data file did not match the definition of the grid header, consequently the data was loaded in the grid but was not shown due to the fact that the name of the fields did not match.
Thank you very much @Will for your interest.
Have a nice weekend.
I have detected the (my) error.
The data.json file was badly formed.
Now jqgrid works correctly.
Thank you @Will
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